CN102719743A - Hot-rolled coil plate for oil casing and manufacturing method thereof - Google Patents

Hot-rolled coil plate for oil casing and manufacturing method thereof Download PDF

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Publication number
CN102719743A
CN102719743A CN2012102138426A CN201210213842A CN102719743A CN 102719743 A CN102719743 A CN 102719743A CN 2012102138426 A CN2012102138426 A CN 2012102138426A CN 201210213842 A CN201210213842 A CN 201210213842A CN 102719743 A CN102719743 A CN 102719743A
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hot
temperature
iron
steel
slab
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胡松涛
崔天燮
王育田
薛文广
张彥睿
边育秀
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Shanxi Taigang Stainless Steel Co Ltd
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Shanxi Taigang Stainless Steel Co Ltd
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Abstract

The invention relates to a hot-rolled coil plate for an oil casing and a manufacturing method thereof. The hot-rolled coil plate comprise, by mass percent, 0.10 to 0.21 of C, 0.10 to 0.25 of Si, 1.0 to 1.50 of Mi, 0.010 to 0.020 of Al, less than or equal to 0.020 of P, no more than 0.010 of S, 0,012 to 0.045 of Nb, 0.005 to 0.020 of Ti, and the balance Fe and inevitable impurities. The tensile strength Rm is more than or equal to 655Mpa, the yield strength Rt 0.5 is 379-552Mpa, the elongation A50% is more than or equal to 24, and the hardness HV10 is less or equal to 248. The manufacturing method includes:LF refining, the S being less than or equal to 0.004%; RH refining, subjecting the molten steel to Ca treatment; slab continuous casting, the temperature being in a range from 1527 DEG C to 1547 DEG C, and the casting speed being less than or equal to 1.2m/min; slab heating, the temperature being in a range from 1150 DEG C to 1230 DEG C; roughing mill group rolling, the final temperature being in a range from 750 DEG C to 920 DEG C; laminar cooling; and coiling. The hot-rolled coil plate for the oil casing has low yield ratio and good welding performances, and no subsequent thermal treatment is needed.

Description

A kind of petroleum casing pipe is with hot-rolled coil and method of manufacture thereof
Technical field
The present invention relates to a kind of petroleum casing pipe with hot-rolled coil and method of manufacture thereof, the petroleum casing pipe that promptly is the K55 grade of steel is with hot-rolled coil and method of manufacture thereof.
Background technology
Petroleum casing pipe is a lifeline of keeping the oil well operation.Be mainly used in the drilling process with completion after to the support of the borehole wall, with the normal operation of whole oil well after the carrying out that guarantee drilling process and the completion.Because geologic condition is different, the down-hole strained condition is complicated, and tensile, compressive, bending, twisting stress comprehensive action are in body; This quality to sleeve pipe itself has proposed higher requirement; In case itself damages sleeve pipe for a certain reason, possibly cause the underproduction of whole mouthful of well, even scrap.
Intensity sleeve pipe by steel itself can be divided into different grade of steels, i.e. J55, K55, N80, L80, C90, T95, P110, Q125, V150 etc.Hole condition, well depth difference, the grade of steel of employing is also different.Under corrosive environment, also require sleeve pipe itself to have corrosion resistance.Also require sleeve pipe to have anti-squeezing in the place of complicated geological condition and ruin performance.
Early stage petroleum casing pipe mainly uses weldless steel tube; Along with improving constantly of ERW (high-frequency resistance welding) weldprocedure and hot-rolled coil quality product, ERW soldering oil casing is even with its wall thickness, ovality good, the constantly stable characteristics that improve of chemical ingredients progress into the application stage.With welded tube mode production well sleeve pipe have the dimensional precision height, characteristics such as specification limit is wide, production cost is low, production efficiency height.
At present, external ERW soldering oil casing accounts for about 50% of total consumption.At Chinese Application of ER W soldering oil casing is since the nineties in last century, and annual now output is about 350,000 tons.The consumption that mainly is J55 is maximum, and the K55 sleeve pipe is big owing to coils of hot-rolled steel production difficulty, and consumption is less relatively.
Middle and high end trade mark K55 in the petroleum casing pipe except needs satisfy HS, H.T. and the weldability of conventional pipe line steel requirement, also must satisfy high tough matched performance---low yield strength ratio.With regard to the K55 steel level oil bushing, API SPEC 5CT standard code: the ys of body between 379-552 MPa, tensile strength >=655MPa.
The 37Mn5 steel grade is generally adopted in the production of K55 seamless tube, about 0.37%, the manganese content about 1.5% of its carbon content; Roll the back ys about 450Mpa; Tensile strength has well satisfied the requirement of K55 grade of steel weldless steel tube mechanical property, still greater than 700Mpa; The carbon equivalent of 37Mn5 is greater than 0.6, welding property caused have a strong impact on.Obviously, the 37Mn5 steel grade is not suitable for the production of ERW welded tube.
Adopt the ERW welded tube to produce the K55 grade of steel, for guarantee coiled sheet shear end to end the butt welding operation smoothly, generally all the carbon equivalent of hot-rolled coil is controlled at below 0.4, otherwise is prone to cause broken belt, influence is produced.
After the tubulation moulding, body is compared with coiled sheet, and ys can increase, and tensile strength is constant basically.It seems from present research, guarantee that simultaneously high tough matched performance--there is certain difficulty in-low yield strength ratio.This has just proposed higher requirement to design of chemical composition, controlled rolling process, cooling control technology and structural state.
Big former of petroleum casing pipe K55 sleeve pipe production difficulty because: 1. unclear to the Changing Pattern understanding of plate pipe ys; 2. to reach desired low yield strength ratio difficulty very big for the coils of hot-rolled steel under the low-carbon-equivalent.
Have bibliographical information to adopt the homogeneous tube thermal treatment process, this technology is then relatively low to the performance requriements of coils of hot-rolled steel, does not require that coil of strip has low yield tensile ratio, but it is higher to carry out the heat treated cost of homogeneous tube behind the tubulation, has realized volume shipment.(seeing document " research and development of high frequency resistance welding K55 steel-grade bushing ", " steel pipe ", in August, 2008, the 37th the 4th phase of volume).
The yield behavior of steel receives the factor affecting such as volume(tric)fraction, form and dislocation desity of its types of organization, grain-size, each phase.For intensity and the yield tensile ratio of obtaining more satisfactory steel, crucial each characteristic parameter that just is how to control its weave construction.
Therefore, through ideal tissue and the performance with acquisition oil casing pipe steel K55 such as control chemical ingredients, Heating temperature, roughing finishing temperature, the middle made-up belt thickness of roughing outlet, finish rolling finishing temperature, relaxation time, laminar flow speed of cooling, coiling temperature.
Existing patent of closing oil casing pipe steel K55 has:
1) Chinese patent, publication number CN 101082099A, application number 200610027021.8, " a kind of low-yield-ratio straight welding oil annular tube steel and method of manufacture thereof ", C content is at 0.20-0.30%.
2) Chinese patent, application number 200910048199.4, application publication number CN 1O1845583A, " oil casing pipe steel and method of manufacture thereof "; C content is at 0.31-0.35%, and selectivity interpolation Mo0.05-0.35%, compares with the patent of application number 200610027021.8, equally adopt carbon manganese steel, but all there is difference in composition and hot rolling technology, and carbon content is higher, influences welding property.
3) Chinese patent, application number 200710093884.X, publication number CN 101328559A, " low yield strength ratio oil casing pipe steel, petroleum casing pipe and method for making thereof "; C content is produced resistance welding or the seamless petroleum casing pipe of K55 at 0.19-0.27%, and follow-up need carry out the steel pipe thermal treatment that intercritical hardening increases temperature the tempering mode.
Summary of the invention
In order to overcome the above-mentioned deficiency of existing petroleum casing pipe with hot rolled strip; The present invention provide a kind of have low yield strength ratio, good welding property and need not to carry out subsequent heat treatment high-grade petroleum casing pipe use hot rolled strip, a kind of method of manufacture of this hot rolled strip is provided simultaneously.
For achieving the above object, technical scheme of the present invention is: with C, Si, Mn, Al is main alloy element, is micro alloying element with Nb, Ti.Through low-temperature heat, controlled rolling, middle made-up belt gauge control, segmentation controlled chilling, control relaxation time, control finish to gauge and coiling temperature, obtain ferritic and bainite structure, ferritic and pearlitic structure.
The present invention provides a kind of petroleum casing pipe (K55 grade of steel) to use hot-rolled coil, and the mass percent of its chemical ingredients is:
C:0.10~0.21; Si:0.10~0.25; Mn:1.0~1.50; Al 0.010~0.020;
P:≤0.020; S:≤0.010; Nb:0.012~0.045; Ti:0.005~0.020;
Surplus is Fe and unavoidable impurities element.
Its mechanical property is following:
Its tensile strength Rm>=655Mpa, ys Rt 0.5Be 379-552 Mpa, elongation A 50% >=24, hardness HV10≤248, yield tensile ratio is 0.58-0.84.Satisfy the performance requirement of the K55 petroleum casing pipe of virtually any size specification to hot rolled strip.
Producible dimensions is:
Roll bending thickness 3.0~25.4mm, wide 1000~2130mm.
Petroleum casing pipe of the present invention also has following characteristics with hot-rolled coil: 180 ° of horizontal cold bending test d=2a are intact; Summer is impacted 0 ℃ of single (on average) >=34 (45) J of ballistic work 10 * 10 * 55mm than V-type; Summer is impacted 0 ℃ of shear area >=80% than V-type.
A kind of petroleum casing pipe of the present invention with hot-rolled coil and method of manufacture thereof in, the cause that each composition is confirmed is following:
Carbon: be strengthening element most economical, the most basic in the steel, but C content improves, all can have a negative impact to ductility, toughness and the weldableness of steel.Therefore, this patent C content is controlled in the 0.10-0.21% scope.Reduced of the negative impact of C height, guaranteed to obtain low yield tensile ratio simultaneously ductility, toughness and the weldableness generation of steel.
Silicon: reduce silicone content, favourable to formability, weldableness, toughness and the plasticity that improves steel, therefore, this patent Si content is controlled in the 0.10-0.25% scope.
Manganese: add an amount of Mn, can improve the hardening capacity of steel, produce the effect of solution strengthening, remedy the strength degradation that low-carbon (LC) causes.It is a certain amount of that but Mn content surpasses, and then is prone to produce segregation, forms banded structure.Therefore, this patent Mn content is controlled in the 1.0-1.50% scope.
Aluminium: aluminium is the main deoxidant element and solid N element in the steel.We utilize Ti 2O 3Performance stable properties very at high temperature is through the tiny Ti that is evenly distributed in the steel 2O 3Improve the toughness of steel pipe HAZ, and in actual production, for obtaining enough tiny Ti 2O 3, must try one's best and reduce the element al that very strong avidity is arranged with oxygen.This patent Al content is controlled at≤and 0.020%.
Phosphorus: be unavoidable impurities element in the steel, phosphorus is prone to produce segregation, and is low more good more.Therefore, this patent P content be controlled at≤0.020%.
Sulphur: be extremely deleterious element, this patent S content control≤0.010 %.
Niobium: niobium has the effect of grain refining, solution strengthening, phase transformation strengthening, precipitation strength, is the grain refining effect the most significantly, when gaining in strength, can also reduce ductile-brittle transition temperature, improves low-temperature flexibility; Nb can also possess non-ageing, improves the formability of steel; Can improve safe range of stress through adding Nb formation ferritic-bainite structure; Nb can postpone austenite recrystallization, reduce transformation temperature, and solid solution Nb can separate out through strain inducing in course of hot rolling, on dislocation, subgrain boundary, crystal boundary, precipitates and separates out, and behind controlled rolling and controlled cooling, changes tiny phase-change product into.Contain the embrittlement temperature district (900-700 ℃) that the Nb steel also exists high temperature extension performance obviously to reduce, be prone to when continuous casting, occur crackle, but after adding trace Ti, the embrittlement temperature district disappears.This is because in the austenite high-temperature zone, and (N C) more is prone to generate TiN than Nb; So N is fixed on the austenite high-temperature zone by TiN, (N C) has become at austenite cold zone and NbC that γ+the α two-phase region is difficult to separate out the Nb precipitate from Nb; Therefore, Ti and Nb exist simultaneously.Therefore, this patent adds Nb content 0.012~0.045%.
Titanium: the main effect of titanium in steel is refined crystalline strengthening and precipitation strength; Titanium at high temperature combines with N, forms highly stable TiN particle, in austenite, can suppress growing up of austenite crystal through disperse, tiny TiN particle, but more than 1400 ℃ the time, the TiN particle begins alligatoring or dissolving, and its effect begins forfeiture.Because Ti 2O 3At high temperature performance is very stable, and the control of the crystal grain of heat affected zone utilizes the tiny Ti that is evenly distributed in the steel when helping welding 2O 3Improve the toughness of steel pipe HAZ.This particle is general to coexist and separates out at the austenite crystal intragranular with MnS, TiN.In actual production, for obtaining enough tiny Ti 2O 3, must try one's best and reduce the element al that very strong avidity is arranged with oxygen.Therefore, this patent improves the performance of steel through adding 0.005%~0.020% Ti.
Contain Nb, Ti steel and all have uniform, good low temperature moulding property on the whole.
The step that petroleum casing pipe of the present invention uses the method for manufacture of hot-rolled coil to comprise is:
Hot metal pretreatment → converter smelting → (Argon processing) → LF external refining+RH external refining → sheet billet continuous casting → slab heating → high-pressure water descaling → roughing unit is rolling → and high-pressure water descaling → finishing train is rolling → and laminar flow cools off → batches.
For ensuring the quality of products, also should carry out quality and service check, before dispatching from the factory, to carry out packing mark and warehouse-in.
Petroleum casing pipe of the present invention is with the method for manufacture of hot-rolled coil, and it comprises following sequential steps:
The LF refining:
Molten steel desulfurizing that will be behind converter smelting is to S≤0.004%,
The RH refining:
Vacuum outgas behind the vacuum breaker, is carried out Ca to molten steel and is handled, to inclusion modification.
Sheet billet continuous casting:
A continuous casting temperature: 1527~1547 ℃.
B continuous casting pulling rate :≤1.2m/min.
The slab heating:
Slab is put into process furnace, slab heating temperature: 1150 ℃~1230 ℃.
The roughing high-pressure water descaling:
The slab of heating is removed the iron scale that billet surface generates through the roughing high-pressure water descaling.
The roughing unit is rolling:
Roughing mill group termination temperature: 930 ℃~1070 ℃.Middle made-up belt thickness: 25~60mm.
Finish rolling high-pressure water descaling case:
Before going into finish rolling, remove the secondary oxidation iron sheet on middle made-up belt surface through finish rolling high-pressure water descaling case.
Finishing train is rolling:
Finishing train final temperature: 750 ℃~920 ℃.
The laminar flow cooling:
Cold before the employing+air cooling+back is cold, air cooling+back the is cold segmentation type of cooling, cooling rate >=2.5 ℃/s, the relaxation time is: 5~50 seconds.
Batch:
Steel band coiling temperature: 150 ℃~620 ℃.
For ensuring the quality of products, also should carry out quality and service check.Before dispatching from the factory, to paste packing mark and warehouse-in.
Say that in detail petroleum casing pipe of the present invention with hot-rolled coil step of manufacturing characteristic is:
IHot metal pretreatment
It is clean to skim during hot metal pretreatment, after the hot metal pretreatment, the S in the molten iron is reduced to S≤0.005%;
IIConverter smelting
80~95% preprocessed molten iron, the steel scrap ([S]≤0.03%) that will meet converter smelting add in the converter.During converter tapping, molten steel per ton adds ferro-aluminum 5~7 Kg, adds electrolytic manganese and ferro-siliconization, and molten steel per ton adds electrolytic manganese 10~15Kg and ferrosilicon 1.5~3.0Kg.
IIIThe LF refining
Add Wingdale during the LF refining, molten steel per ton adds lime 4~8Kg and takes off S, and S is taken off to being not more than 0.004%, afterwards, adds Nb iron and Ti iron microalloying, and molten steel per ton adds Nb iron 0.2~0.6Kg, Ti iron 0.2~0.5Kg.And be not less than 5 minutes with the time of stirring a little less than BOTTOM ARGON BLOWING flow 20~200NL/ min.
IVThe RH refining
Be not more than under the 10mbar state in the vacuum pressure value, be not less than 10 minutes cycling time.Behind the vacuum breaker, molten steel is carried out Ca handle, to inclusion modification, the soft stirring of BOTTOM ARGON BLOWING (the argon flow 20~200NL/ min) time is not less than 7 minutes.
Through assay, the composition weight percent of molten steel is:
C:0.10~0.21 Si:0.10~0.25 Mn:1.0~1.50 ?Al:0.010~0.020
P:≤0.020 S:≤0.010 Nb:0.012~0.045 Ti:0.005~0.020
All the other are balance-element Fe and unavoidable impurities element;
VSheet billet continuous casting
Molten steel in the ladle is joined in the tundish, and through mold, continuous casting becomes slab, and the continuously cast bloom pulling rate is not higher than 1.2m/min, continuous casting temperature, 1527~1547 ℃.
VIThe slab heating
Slab is put into process furnace, slab heating temperature, 1150 ℃~1230 ℃, be >=150min heat-up time.
VIIThe roughing high-pressure water descaling
The slab of heating is removed the iron scale that billet surface generates through the roughing high-pressure water descaling.
VIIIThe roughing unit is rolling
Slab is become middle made-up belt, final temperature, 930 ℃~1070 ℃ through 5~7 passage reversible rollings on the roughing unit.Middle made-up belt thickness: 25-60mm.
IXThe finish rolling high-pressure water descaling
Before going into finish rolling, remove the secondary oxidation iron sheet on middle made-up belt surface through finish rolling high-pressure water descaling case.
XFinishing train is rolling
Middle made-up belt is rolled into hot rolled strip, final temperature on 7 frame finishing train: 750 ℃~920 ℃;
XIThe laminar flow cooling
Band is after steel goes out finishing train, and is cold before the employing+air cooling+back is cold, air cooling+back the is cold segmentation type of cooling through laminar cooling system, cooling rate >=2.5 ℃/s, and the relaxation time is: be chilled to 150 ℃~620 ℃ in 5~50 seconds;
XIIBatch
Help the all-hydraulic portable reeling machine of winding up roller to coil into coil of strip, coiling temperature through 3: 150 ℃~620 ℃.
Above-mentioned petroleum casing pipe is characterized in that with hot-rolled coil and method of manufacture thereof: when step II, III, IV, alloy addition calculates and is undertaken by table 1 grade, if grade changes, add-on need be carried out corresponding conversion.
Table 1 calculates alloy addition article bit table
Title Ferro-aluminum Ti iron Nb iron Electrolytic manganese Si iron The Si-Ca line
Grade Al:36-46% Ti≥65% Nb≥60% Mn≥97% Si≥70% Core powder Ca content 25-35%
Petroleum casing pipe of the present invention is used hot-rolled coil; Its ys is 379-552 Mpa, tensile strength Rm >=655Mpa, and yield tensile ratio is 0.58-0.84; Satisfy the performance requirement of the K55 petroleum casing pipe of virtually any size specification, have good low yield strength ratio and high tough matched performance hot rolled strip.
Describe in the face of the method for manufacture mechanism of a kind of petroleum casing pipe of the present invention down with hot-rolled coil.
Has good corrosion resistance for guaranteeing after petroleum casing pipe is with the hot-rolled coil tubulation among the present invention; Control to S content has strict demand, need select the high-quality steel scrap for use, takes off most slag during hot metal pretreatment; Hot metal pretreatment is to S≤0.005%; Get into converter smelting, the dark desulfurization of LF is adopted in the back, takes off to S≤0.004%.For guaranteeing purity of steel, need carry out the RH vacuum outgas and handle, behind the vacuum breaker, also molten steel is carried out Ca and handle, inclusion modification.
For guaranteeing purity of steel, the continuously cast bloom pulling rate is not higher than 1.2m/min among the present invention.Slab for preventing grain growth, improves and rolls back plasticity and toughness when the process furnace internal heating, and heating and temperature control is at 1150 ℃-1230 ℃; Rolling technology is 930-1070 ℃ of a roughing final temperature, middle made-up belt thickness: 25-60mm; 750-920 ℃ of finish rolling final temperature; Laminar flow cooling is adopted: preceding cold+air cooling+back is cold, air cooling+back the is cold segmentation type of cooling, cooling rate >=2.5 ℃/s, the relaxation time is: 5-50 second; 150-620 ℃ of steel band coiling temperature.The stainless steel belt that present method is produced obtains is organized as evenly tiny ferritic and bainite structure, ferritic and pearlitic structure.
In sum, the present invention has following characteristics:
1, the present invention is with low-temperature heat technology, and through made-up belt temperature in the middle of the outlet of control roughing unit, middle made-up belt thickness obtains good original austenite grains size, obtains desired excellent in toughness performance; Through control finish rolling finishing temperature; Cold before the employing+air cooling+back is cold, air cooling+back the is cold laminar flow type of cooling; Control relaxation time length, speed of cooling and coiling temperature obtain ferritic and bainite structure, ferritic and pearlitic structure, to obtain low yield tensile ratio performance index requirement; Satisfy high-grade petroleum casing pipe K55 and reach the API standard-required with high tough matched performance.
2, petroleum casing pipe of the present invention has excellent comprehensive performances with hot-rolled coil; HS, low yield strength ratio, good toughness; Its ys is 379-552 Mpa, tensile strength Rm >=655Mpa, and yield tensile ratio is 0.58-0.84;-10 ℃ of ballistic works can reach 225J, and have good cold-bending property.Be suitable for the use of complicated down-hole state
3, petroleum casing pipe of the present invention adopts low-temperature heat+cooling controlling and rolling controlling process production with hot-rolled coil, with the delivery of hot rolling attitude, need not to heat-treat, and production cost is low, and production operation is simple, produces the high welded tube mode production characteristics of efficient.
High-strength low-alloy steel is handled through the critical zone or controlled rolling and controlled cooling can obtain with the dual-phase hot-rolled attitude tissue of ferritic+martensite+residual austenite, ferritic (softer phase-can obtain lower ys) and special ferritic substructure < intracrystalline block with sheet columnar ferrite>and perlite delicate tissues (than by force mutually-can obtain advantages of higher tensile strength) or ferritic+bainite duplex structure, make it have the advantages such as welding property of ys is low, tensile strength is high, good plasticity and toughness, excellence.
Therefore, the present invention through made-up belt thickness, finish rolling finishing temperature, relaxation time, laminar flow speed of cooling, coiling temperature in the middle of control chemical ingredients, Heating temperature, roughing finishing temperature, the roughing outlet obtained to have a kind of petroleum casing pipe (K55 grade of steel) with the ideal tissue and the performance of hot-rolled coil.
Embodiment
Specify embodiment of the present invention below in conjunction with embodiment, but embodiment of the present invention is not limited to following embodiment
Hot-rolled coil embodiment one
Specify the technical characterictic of roll bending of the present invention below with present embodiment.The petroleum casing pipe of present embodiment (K55 grade of steel) uses the mass percent of the chemical ingredients of hot-rolled coil to be:
C:0.18 Si:0.195 Mn:1.26 P:0.011 S:0.002 Al:0.018
Nb:0.018 Ti:0.014
Surplus is Fe and unavoidable impurities element.
The thick 12.2mm of the roll bending of present embodiment, wide 1600mm, long 193.6m.
Its tensile strength Rm=715Mpa, ys is Rt 0.5=465Mpa, yield tensile ratio is 0.65, satisfies the performance requirement of K55 petroleum casing pipe to hot rolled strip.
Hot-rolled coil method of manufacture embodiment one
Specify step of manufacturing of the present invention with present embodiment below.Present embodiment is at 180 tons of top and bottom combined blown converters and the enterprising row of 2250mm hot continuous rolling unit.Present embodiment comprises following sequential steps:
IHot metal pretreatment
It is clean to skim during hot metal pretreatment, after the hot metal pretreatment, the S in the molten iron is taken off to 0.005%;
IIConverter smelting
To meet converter smelting 170 tons of preprocessed molten irons, 30 tons of steel scraps ([S]≤0.03%), add in the converter.During converter tapping, molten steel per ton adds ferro-aluminum 5.5 Kg, and electrolytic manganese 12Kg and ferrosilicon 2.1Kg are behind hot metal pretreatment, converter smelting, and molten steel composition reaches the following compositions mass percent, can tap.
C:0.05 Si:0.02 ?Mn:0.06 P:0.008 S:0.008
Surplus is Fe and unavoidable impurities element.
Converter terminal temperature: 1671 ℃.
Send the Argon station to carry out Argon after the tapping and handle, blowing argon gas flow 220NL/min carries out stir process.
Go out Argon station composition:
C:0.17,?Si:0.16 Mn:1.40 P:0.009 S:0.010 Al:0.051
Surplus is Fe and unavoidable impurities element.
Go out Argon station temperature: 1593 ℃.
IIIThe LF refining
To, hot metal pretreatment, converter smelting, Argon get into furnaceman's LF preface after handling:
LF adds quantitative sweetening agent Wingdale 1710Kg, and S is taken off to 0.0013%, and during tapping, molten steel per ton adds Nb iron 0.5Kg, Ti iron 0.4Kg microalloying, the fine setting composition.And to stir 6 minutes time a little less than the BOTTOM ARGON BLOWING flow 80NL/ min.
The mass percent of molten steel composition reaches following value and gets final product:
C:0.18 Si:0.20 Mn:1.26 P:?0.010 S:?0.002
Al 0.021 Nb:0.018 Ti:0.014
Surplus is Fe and unavoidable impurities element.
1573 ℃ of out-station temperatures.
IVThe RH refining
Under vacuum pressure value 8mbar state, circulated 12 minutes.Behind the vacuum breaker, feeding 600mCa-Si line carries out Ca to molten steel and handles, weak afterwards the stirring 10 minutes, and argon flow amount 120NL/min carries out inclusion modification and handles.
The weight percent of molten steel composition is:
C:0.18 Si:0.195 Mn:1.26 P:0.011 S:0.002
Al:0.018 Nb:0.018 Ti:0.014 N:0.0048 Ca:0.00051
Surplus is Fe and unavoidable impurities element.
VSheet billet continuous casting
Molten steel in the ladle is joined in the tundish, and through mold, continuous casting becomes slab, continuously cast bloom pulling rate 1.1m/min, 1537 ℃ of continuous casting temperature;
Slab specification: thickness 200mm, width 1610mm, length 11000mm;
Slab quantity: 7;
The slab naturally cooling.
VIThe slab heating
Slab is heated in walking beam furnace, and be 160min heat-up time, 1200 ℃ of Heating temperatures.
VIIThe roughing high-pressure water descaling
The slab of heating is removed the iron scale that billet surface generates through the roughing high-pressure water descaling.
VIIIThe roughing unit is rolling
Slab in reciprocal rolling 7 passages of four roller reversible roughing units, is rolled into thickness 50mm, width 1616mm, the middle made-up belt of length 48000mm, roughing finishing temperature: 1020 ℃.
IXThe finish rolling high-pressure water descaling
Before the finish rolling, remove the secondary oxidation iron sheet on middle made-up belt surface through finish rolling high-pressure water descaling case.
XFinishing train is rolling
Slab is processed thickness 12.2mm in 7 frame finishing train, width 1600mm, length 193.6m
Steel band, finishing train finishing temperature: 840 ℃.
XIThe laminar flow cooling
After the band steel goes out finishing train, the segmentation type of cooling that cold before taking+air cooling+back is cold, 14 ℃/s of leading portion cooling rate, 38 ℃/s of back segment cooling rate, the relaxation time is: 15 seconds, be cooled to 580 ℃.
XIIBatch
Help the all-hydraulic portable reeling machine of winding up roller with 3, under 580 ℃ of temperature, be rolled into coil of strip.
Through quality and service check, the assay of present embodiment is following:
It is following that it can reach mechanical property:
Its tensile strength Rm=715Mpa, ys is 465 Mpa, elongation A 50=24%; Hardness HV10 is 221/222/220; Yield tensile ratio 0.65; 180 ° of horizontal cold bending test d=2a are intact; Summer is impacted 0 ℃ of ballistic work 10 * 10 * 55mm single (on average), 95/90/84 (90) J than V-type; Summer is impacted 0 ℃ of shear area 100% than V-type.
Roll bending thickness 12.2mm, wide 1600mm.
To paste packing mark and warehouse-in before dispatching from the factory.
The composition of other embodiment of hot-rolled coil is seen table 2
The composition of other embodiment of table 2 hot-rolled coil
Embodiment C Si Mn P S V Mo AL Nb Ti
Roll bending example I 0.18 0.195 1.26 0.011 0.002 0.001 0.006 0.018 0.018 0.014
Roll bending example II 0.14 0.189 1.45 0.012 0.003 0.001 0.001 0.016 0.019 0.011
Roll bending example III 0.15 0.195 1.21 0.011 0.004 0.001 0.006 0.019 0.020 0.010
Roll bending example IV 0.12 0.167 1.15 0.014 0.002 0.002 0.002 0.015 0.032 0.013
Roll bending example V 0.11 0.164 1.30 0.013 0.002 0.001 0.002 0.016 0.030 0.015
Processing parameter and the roll bending performance of other method of manufacture of hot-rolled coil embodiment are seen table 3
Processing parameter and the roll bending performance of other method of manufacture of table 3 hot-rolled coil embodiment
Figure 2012102138426100002DEST_PATH_IMAGE001

Claims (5)

1. a petroleum casing pipe is used hot-rolled coil, and the mass percent of its chemical ingredients is:
C:0.10~0.21; Si:0.10~0.25; Mn:1.0~1.50; Al 0.010~0.020;
P:≤0.020; S:≤0.010; Nb:0.012~0.045; Ti:0.005~0.020;
Surplus is Fe and unavoidable impurities element.
2. petroleum casing pipe according to claim 1 is used hot-rolled coil, it is characterized in that it has following mechanical property:
Tensile strength Rm>=655Mpa, ys Rt 0.5Be 379-552 Mpa, elongation A 50% >=24, hardness HV10≤248, yield tensile ratio is 0.58-0.84.
3. a petroleum casing pipe is with the method for manufacture of hot-rolled coil, and it comprises following sequential steps:
The LF refining
Molten steel desulfurizing that will be behind converter smelting is to S≤0.004%;
The RH refining
Vacuum outgas behind the vacuum breaker, is carried out Ca to molten steel and is handled, to inclusion modification;
Sheet billet continuous casting
A continuous casting temperature: 1527~1547 ℃;
B continuous casting pulling rate :≤1.2m/min;
The slab heating
Slab is put into process furnace, slab heating temperature: 1150 ℃~1230 ℃;
The roughing unit is rolling
Roughing mill group termination temperature: 930 ℃~1070 ℃, middle made-up belt thickness: 25~60mm;
Finishing train is rolling
Finishing train final temperature: 750 ℃~920 ℃;
The laminar flow cooling
Cold before the employing+air cooling+back is cold, air cooling+back the is cold segmentation type of cooling, cooling rate >=2.5 ℃/s, the relaxation time is: 5~50 seconds;
Batch
Steel band coiling temperature: 150 ℃~620 ℃.
4. petroleum casing pipe according to claim 3 is used the hot-rolled coil method of manufacture, and its steps characteristic is:
IHot metal pretreatment
It is clean to skim during hot metal pretreatment, after the hot metal pretreatment, the S in the molten iron is reduced to S≤0.005%;
IIConverter smelting
80~95% preprocessed molten iron, the steel scrap ([S]≤0.03%) that will meet converter smelting add in the converter;
During converter tapping, molten steel per ton adds ferro-aluminum 5~7 Kg, adds electrolytic manganese and ferro-siliconization, and molten steel per ton adds electrolytic manganese 10~15Kg and ferrosilicon 1.5~3.0Kg;
IIIThe LF refining
Add Wingdale during the LF refining, molten steel per ton adds lime 4~8Kg and takes off S, and S is taken off to being not more than 0.004%, afterwards, adds Nb iron and Ti iron microalloying, and molten steel per ton adds Nb iron 0.2~0.6Kg, Ti iron 0.2~0.5Kg; And be not less than 5 minutes with the time of stirring a little less than BOTTOM ARGON BLOWING flow 20~200NL/ min;
IVThe RH refining
Be not more than under the 10mbar state in the vacuum pressure value, be not less than 10 minutes cycling time; Behind the vacuum breaker, molten steel is carried out Ca handle, to inclusion modification, the soft churning time of BOTTOM ARGON BLOWING is not less than 7 minutes;
Through assay, the composition weight percent of molten steel is:
C:0.10~0.21 Si:0.10~0.25 Mn:1.0~1.50 ?Al:0.010~0.020
P:≤0.020 S:≤0.010 Nb:0.012~0.045 Ti:0.005~0.020
All the other are balance-element Fe and unavoidable impurities element;
VSheet billet continuous casting
Molten steel in the ladle is joined in the tundish, and through mold, continuous casting becomes slab, and the continuously cast bloom pulling rate is not higher than 1.2m/min, continuous casting temperature, 1527~1547 ℃;
VIThe slab heating
Slab is put into process furnace, slab heating temperature, 1150 ℃~1230 ℃, be >=150min heat-up time;
VIIThe roughing high-pressure water descaling
The slab of heating is removed the iron scale that billet surface generates through the roughing high-pressure water descaling;
VIIIThe roughing unit is rolling
Slab is become middle made-up belt, final temperature, 930 ℃~1070 ℃ through 5~7 passage reversible rollings on the roughing unit; Middle made-up belt thickness: 25-60mm;
IXThe finish rolling high-pressure water descaling
Before going into finish rolling, remove the secondary oxidation iron sheet on middle made-up belt surface through finish rolling high-pressure water descaling case;
XFinishing train is rolling
Middle made-up belt is rolled into hot rolled strip, final temperature on 7 frame finishing train: 750 ℃~920 ℃;
XIThe laminar flow cooling
Band is after steel goes out finishing train, and is cold before the employing+air cooling+back is cold, air cooling+back the is cold segmentation type of cooling through laminar cooling system, cooling rate >=2.5 ℃/s, and the relaxation time is: be chilled to 150 ℃~620 ℃ in 5~50 seconds;
XIIBatch
Help the all-hydraulic portable reeling machine of winding up roller to coil into coil of strip, coiling temperature through 3: 150 ℃~620 ℃.
According to claim 3 or 4 described petroleum casing pipes with the method for manufacture of hot-rolled coil, it is characterized in that: when step II, III, IV, alloy addition calculates and is undertaken by following requirement, if grade changes, add-on need be carried out corresponding conversion;
Ferro-aluminum: Al:36-46%; Ti iron: Ti >=65%; Nb iron: Nb >=60%;
Electrolytic manganese: Mn >=97%; Si iron: Si >=70%; Si-Ca line: core powder Ca content 25-35%.
CN2012102138426A 2012-06-27 2012-06-27 Hot-rolled coil plate for oil casing and manufacturing method thereof Pending CN102719743A (en)

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